Neutrinoless Double Beta Decay of 76Ge. Preliminary Results of an Experiment in the Frejus Tunnel
As is well known the detection of the neutrinoless double beta decay of nuclei — would indicate the violation of lepton number and would provide significant info mation about the character, possible mass and chirality couplings of the neutrino. Several direct experiments aiming to detect such a rare event have been recently carried out or are being done. We present here the preliminary results of an — attempt to search for the neutrinoless double beta decay of 7 6Ge, currently being done in the Frejus tunnel. The experiment (which uses as source and detector an — assembly of 4 Germanium crystal ) investigates the transition from the ground state 0+ of the 7 6Ge to the ground state 0+ of 7 6Se, as well as to the excited sta te 2+ (559.1 KeV), of 7 6Se, looking for a gaussian shaped peak at E2β=2040.7 KeV in the anticoincidence spectrum, and at E=1481.6 KeV in the coincidence spectrum 2β/γ (Eγ=559.1 KeV), respectively, by surrounding the 4-Ge detector with a 4π — assembly of NaI scintillators. Transition to the 0<Stack><Subscript>2</Subscript><Superscript>+</Superscript></Stack> (1122.3 KeV) excited state is also investigated.
KeywordsNeutrinoless Double Beta Decay Coincidence Spectrum Probability Density Function Method Enlarge Region Fiducial Volume
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